German special forces have arrested a man suspected of carrying out a triple bomb attack on a bus carrying players and staff from the Borussia Dortmund football club.

Greed is being investigated as a possible motive after the coach was hit as it travelled from a hotel to the team's ground in Dortmund before a Champions League match with AS Monaco.

The 28-year-old suspect, identified in media reports as a German-Russian citizen named Sergej W, allegedly bought shares in the club just before the bombing and planned the attack so he could earn up to €4m (£3.3m) if the stock price plummeted.

It was claimed that he was staying in the same hotel on the day of the attack and had a room that overlooked the street where three devices exploded near the bus on April 11.

Police are investigating whether the bombs were detonated remotely from the hotel room as the bus passed by.

Greed is being investigated as a possible motive (Image: REUTERS)

The suspect reportedly owned shares in the club (Image: REUTERS)

As emergency services descended on the scene and terrified guests ran through the l'Arrivee hotel in the chaotic aftermath, the suspect calmly went to its restaurant and ordered a steak, Bild reported.